Switching system



y 7,1929- R. A. WAITE ET AL 1,711,625

SWITCHING SYSTEM Original Filed Jan 19, 1926 q L- N, q INVENTORS g a; ATTORNEY 45 the acceleration and retardation of the ele- Patented May 7, 1929 UNITED STATES 1,711,625 PATENT OFFICE.

RAYMOND A. WAITE, OF YONKERS, NEW YORK, AND FRANK L. MORRIS, OF RIDGE- WOOD, NEW JERSEY, ASSIGNORS T0 OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SWITCHING- SYSTEM.

Original application filed January 19, 1926, Serial No. 82,258. Divided and this application filed April- 19, 1927. Serial No. 184,922.

This application is a division of application Serial No. 82,258, filed January 19, 1926.

The invention relates to st itching systems.

In theparent application, above referred to, a system is described for controlling elevators. It is important in elevator installations that the motor for raising and lowering the elevator can be controlled in such manner that smooth acceleration and retardation of the car is obtained. The control apparatus disclosed in the parent application includes a switching system for controlling the acceleration and retardation of the hoisting motor.

One feature of the invention resides in the provision of a switching system for controlling the acceleration and retardation of a motor in which the proper sequence and time of operation of the accelerating switchesis assured both during accelerating and retarding periods.

Another feature of the invention is the provision of a switching system which is simple 'in nature and which consumes a minimum of power.

Other features and advantages will become apparent from the following description and appended claims.

In the drawing, the single figure is a wiring diagram of a switching system embodying the invention.

The reference characters and 58' indicate the wires leading to" the source of power supply. The car switch for controlling the elevator car isdesignated as 'a whole by the reference character 48. The first accelerating switch-is designated as a whole by the reference character D and the second accelerating switch is designated as a whole by the reference character E. These accelerating switches are controlled by the car switch and upon operation, cause the shortcircuiting of a resistance 27 for controlling vator hoisting motor; 7 This resistance will hereinafter be termed the accelerating resistance' actances are designated by the character X.

The car switch 48 comprises a set of up contacts-62,

down contacts 67, 68, 69, 70 and 71. The

63, 64, 65' and 66 and a set of contact segment 72 for bridging-the contacts of each set is mounted on asegmental support 73 of insulating material. Thevcar switch is operated by means of a control handle 81. It is preferred toprovide centering springs (not shown) on the car switch to cause it to be returned to oif posi tion when released by the operator. The car is caused to start in the up direction by moving the car switch in a direction to effect the bridging of the up contacts while the car is caused to start in the down direction by moving the car switch in a direction to cause the bridging of the down contacts. The operation of the first and second ac-v celerating switches D and E is effected by moving the car switch in either direction, contacts 65 and 70 controlling the circuit for the actuating coil 141 of the first acceleratingiswitch D and contacts 66 and 71 controlling the circuit for the actuating coil 152 of the second accelerating switch E.

- It will be assumed that the car switch is moved to full operated position in a direction to cause the bridging of contacts 64, 65 and 66. Upon the engagement of car switch segment 72 with contact 65, a circuit is completed for coil 141 of the first accelerating switch D as follows: from supply wire 55, by way of wire 300, through coil 141 of switch D, wire 301, contacts 65 and 64 bridged by segment 72, wire 302, to supply wire 58. The first accelerating switch D, upon operation, in response to the energization of its actuating coil 141, causes the engagement of its contacts 143, 144, 145 and 146. The engagement of contacts 145 of the first accelerating switch D short-circuits section 155 of accelerating resistance 27. The engagement of contacts 146 of the first accelerating switch D completes a circuit for th actuating coil 152 of the second accelerating switch E. This circuit may be traced from supply wire 55, wire 300, by way of wire 303, through first accelerating switch contacts 146, coil 154 of one of the reactances X and coil 152 of the second accelerating switch E, wire 304, contacts 66 and 64 bridged by segment 72 of the car switch, wire 302, to supply wire 58.

The second accelerating switch E does not operate-immediately the circuit for its actuating coil is completed, its action being de- I short circuit around a portion of resistance 160, this resistance being connected in shunt to coil 163 of the other of.the reactances X and the holding coil 161 of the first accelerating switch D. The engagement of contacts 158 of the second accelerating switch E completes the circuit for the holding coil 161 of the first accelerating switch 1)." This circuit may be traced from supply wire 55, by wayof wire 305 throu'gh contacts 158 of switch E, by way of wire 306 through reactance coil 163 and holding coil -161 of switch E, to supply wire 58. 'The. separation of contacts156 before contacts 158 engage prevents excess power consumption" from the source of power supply. The engagement of contacts 157 of the second accelerating switch E short-circuits section 165 of the accelerating resistance 27 When it is desired to bring the elevator car to a stop, the car switch is returned to off position. Upon the disengagement of car switch segment 72 from contacts 66 and 65, the circuits for .the second accelerating switch actuating coil 152 and first accelerating switch actuating coil 141 are broken. The second accelerating switch E drops out immediately. The first accelerating switch is maintained operated, however, by its holding coil 161. a Z

The second accelerating switch E.u on, dropping out, causes the separation 0 its contacts 157 and 158 and the reengagement of its contacts 57 and 156. The separation of contacts 1576f the second accelerating switch E removes the'short circuit for sec tion 165 of accelerating resistance 27.. The separation of contacts 158 of the second accelerating switch E breaks the circuit for holding coil 161 of the first accelerating switch D. The first accelerating switch does not drop out immediately, however, its action being delayed by the effect of reactance coil 163 in series with first accelerating switch holding coil 161 and the discharge resistance 160 in parallel with the reactance coil and the holding coil. The engagement of contacts 156 of the second accelerating switch E to short-circuit a portion of resistance 160 decreases the resistance of the discharge path and thus prolongs the time ele-.

ment of the first accelerating switch in drop ping out. v

The first accelerating switch, upon dropping out, causes the separation of its contacts 143, 144, 145 and 146, the separatlon of contacts 145 removing the short circuit for section 155 of accelerating resistance 27.

As many changes could be made in the above arrangement and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and, not in a limiting sense.

What is claimed is:

1. In combination, a switch having a winding, a resistance connected in parallel with said winding, means for short-circuiting'a portion of said resistance, and means for removing said short circuit prior to the energization of the winding:

2. In combination, a switch having a winding, a resistance connected in parallel with said winding for delaying the operation of the switch after the discontinuation of the supply of current to the winding, and

a second switch for discontinuing the supply of currentto the winding of the first switch and for thereafter 'short-circuiting at least a portion of said resistance so as to prolong the delay ofoperation of the first switch.

In combination, a switch having a winding, a' resistance connected inparallel with. said winding for -delaying the operation'of the switch after the discontinuation of the supply of current to the winding, and means operable after the sup ly of current to said winding has been discontinued to prolong the delay of operation of said switch.

4. In combination, a switch having a winding, a resistan'ce connected in parallel with said winding for delaying the operation of the switch after the discontinuation of the supply of current to the winding,'and means operable after the supply of current tosaid winding has been discontinued to prolong the delay of operation of said switch, said last named means comprising means for decreasing the amount of said resistance.

5. In combination, a switch having a winding, a react-ance coil connected in series with. said winding, a resistance connected in parallel with'said winding and reactance coil for delaying the operation of the switch after the discontinuation of the supply of current to the winding, and means operable after the supply of current to said winding has been discontinued to rolong the delay of operation of said switch said last-named means comprising means for decreasing the amount of said resistance.

In testimony whereof, we have signed our names to this specification.

RAYMOND A. WAITE. FRANK L. MORRIS. 

